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The Universe
| Term | Definition |
|---|---|
| PLANET | A large round mass of rock and metal or of gas that moves in a circular path around the sun or another star. |
| STAR | A ball of burning gas in space that is usually seen from the earth as a point of light in the sky at night. |
| ORBIT | The curved path through which objects in space move around a planet or star. |
| ECLIPSE | When the sun disappears from view, either completely or partly, while the moon is moving between it and the earth, or when the moon becomes darker while the shadow of the earth moves over it. |
| GALAXY | One of the independent groups of stars in the universe. |
| CONSTELLATION | Any of the groups of stars in the sky that seem to form a pattern and have been given names. |
| COMET | An object that moves around the sun, usually at a great distance from it, that is seen on rare occasions from the Earth as a bright line in the sky. |
| METEOR | A piece of rock or other matter from space that produces a bright light as it travels through the atmosphere. |
| MILKY WAY | The galaxy that includes the Earth, seen at night as a pale strip across the sky. |
| ASTEROID | One of many large rocks that circle the sun. |